From Wiki. An Ordinatus, (pl. Ordinatii), are massive war-machines created by the Mechanicum as needed. The Centurio Ordinatus is the organisation responsible for constructing and deploying these war machines. Every individual Ordinatus is a unique construction and is named for the world on which it was first built or employed. Each Ordinatus is unique in that it was designed for a specific purpose, or for a particular battle. Every Ordinatus has a very specialised weapon system configured for their intended role.